JPS628483B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a sealing device between a skirt and a hood in a converter exhaust gas treatment device, which eliminates dust troubles in the sealing device, and improves the sealing device against high pressure in the exhaust gas treatment device. This invention relates to a sealing device between a skirt and a hood that can provide a sufficient seal even when the temperature is low.

First, the outline of the converter exhaust gas treatment apparatus will be explained using FIG. In the figure, pure oxygen is blown into hot metal in a converter 1 from an oxygen injection lance 11 for refining (hereinafter referred to as blowing). During this blowing, a large amount of
CO gas is generated. The CO gas is drawn into the hood 3 by the induced blower 7, cooled by the cooler 4, removed by dust collectors 5 and 6, and stored in the gas holder 9 as a valuable gas. Also, exhaust gas with low CO concentration at the beginning and end of blowing is released from the chimney 8 by switching the damper 10.

In this series of processes, the converter 1 is tilted when receiving hot metal (hereinafter referred to as pig iron receiving), and is also tilted to take out the steel in the converter 1 after finishing blowing (hereinafter referred to as tapping). .

In this way, the converter 1 is tilted when receiving pig iron and tapping the steel, so a skirt 2 that can move up and down is provided between the converter 1 and the hood 3, and when the converter 1 is tilted, the skirt 2 2 is raised to enable tilting of the converter 1, and during blowing, the skirt 2 is lowered to seal between the converter 1 and the hood 3 to prevent CO gas from leaking to the outside.

Also, during blowing, a large amount of dust is generated along with CO gas. In the converter exhaust gas treatment equipment, the generated gas is induced by the induced blower 7, so the pressure inside the skirt 2 and hood 3 is operated at a pressure equal to or slightly lower than atmospheric pressure. However, in the current energy-saving era, the pressure inside the skirt 2 and hood 3 tends to be operated at a pressure higher than atmospheric pressure, and in order to cope with this increase in pressure, it is necessary to improve the sealing mechanism. It's coming. In particular, since CO gas is handled, leakage to the outside is dangerous, and a highly reliable sealing mechanism is required.

A conventional sealing mechanism between a hood and a skirt has a structure shown in FIGS. 2 to 4.

In FIG. 2, a water-sealing jacket 12 filled with water is integrally attached to the skirt 2, and the lower part of a partition tube 13 fixed to a frame 16 is immersed in this water-sealing jacket 12. skirt 2
This water seal sealed the space between the hood 3 and the hood 3.

On the other hand, the skirt 2 is moved up and down by the cylinder 14. FIG. 3 is a partial enlarged view of the sealing part. During blowing, the skirt 2 is lowered and the CO gas is passed between the converter 1 and the hood 3 to the outside by the skirt 2 and the water seal. leakage is prevented. In this state, the CO gas generated in the converter 1 is attracted into the hood 3 as shown by the arrow along with the dust. However, a part of the CO gas enters the space between the outside of the hood 3 and the partition tube 13 together with the dust, and the entered dust is deposited on the bottom of the water seal jacket 12. 15 is accumulated dust.

Next, as shown in FIG. 4, when the skirt 2 is raised during receiving or tapping, the lower end of the partition tube 13 will be in a state of protruding into the accumulated dust 15. The accumulated dust 15 becomes a hard layer over time and settles on the bottom of the water seal jacket 12, and the lower end of the partition tube 13 hits it, making it difficult to lift the skirt 2, necessitating dust removal work, and reducing the frequency of maintenance. In many cases, the disadvantage was that the operating rate decreased.

On the other hand, when the pressure inside the exhaust gas treatment device is high, or when the gas pressure pulsates, the water in the water seal jacket 12 is pushed out by the pressure, causing a break in the water seal.
There is a technical problem that a complete seal cannot be achieved.

SUMMARY OF THE INVENTION The present invention aims to provide a sealing device between a hood and a skirt that solves the above-mentioned conventional dust troubles and can provide sufficient sealing even against high pressure.

The sealing device between the hood and the skirt of the present invention includes:
Instead of a conventional water seal, a retractable joint is provided between the hood and the skirt to create a seal. That is, the upper water cooling jacket is fixed to the frame on both the inside and outside, while the lower water cooling jacket is fixed to the skirt on both the inside and outside, and the inside of these upper and lower water cooling jackets is fitted on the inside, and the outside is fitted on the outside. The skirt can be moved up and down, and an expansion joint is interposed between the inner and outer cylinders to completely seal gas.

An embodiment of the present invention will be described in detail below. In FIG. 5, 17 is an inner water cooling jacket, and 18 is an outer water cooling jacket. The inner and outer water cooling jackets 17 and 18 are fixed to the frame 16 facing each other at a constant interval to form an upper water cooling jacket 21. On the other hand, 22 is a lower water cooling jacket, and this lower water cooling jacket 22 is connected to the inner water cooling jacket 20 and the outer water cooling jacket 1.
9 are fixed to the skirt 2 facing each other at regular intervals.

The above-mentioned upper water cooling jacket 21 and lower water cooling jacket 22 are fitted into two sets of cylinders, and an expansion joint 23 is interposed in these upper and lower water cooling jackets 21 and 22, and its upper end is connected to the frame 16, and its lower end is connected to the frame 16. is fixed to the bottom of the lower water cooling jacket 22.

Note that 24 is an inert gas jetting nozzle, and 25 is a dustproof curtain.

Next, the operation of this embodiment having the above configuration will be explained. FIG. 5 shows the state during blowing when the skirt 2 is lowered.

Most of the CO gas generated in the converter 1 is attracted into the hood 3 together with dust, and a part of it enters the space between the inner water cooling jacket 17 and the hood 3 together with the dust. The dust that has entered in this way is first captured by the dustproof curtain 25. Dust that is not captured by the dustproof screen 25 is blown off by the inert gas jetting nozzle 24, thereby preventing the dust from entering into the upper and lower water cooling jackets 21 and 22.

Further, the space between the inner water cooling jacket 20 and the skirt 2 is in a high pressure inert gas atmosphere ejected from the inert gas ejection nozzle 24, and the dustproof curtain 25
Acts as internal pressure on the inner water cooling jacket 2
Since the space surrounded by the skirt 2 and the dustproof curtain 25 has a higher pressure than the space between the inner water cooling jacket 17 and the hood 3, dust does not enter. In this manner, the expansion joint 23 performs gas sealing while receiving internal pressure without intrusion of dust.

In addition, the expansion joint 23 connects the upper and lower water cooling jackets 2.
1, 22, and is cooled and protected from high temperature atmosphere.

Further, when the skirt 2 is raised, the dust adhering to the dustproof curtain 25 is blown away by the inert gas that passes through the dustproof curtain and is ejected, and falls into the inside of the skirt 2.

As described in detail above, the sealing device between the skirt and the hood of the present invention fits the upper water cooling jacket and the lower water cooling jacket into two sets of cylinders to enable the skirt to move up and down, and the upper and lower water cooling jackets are connected to each other in the upper and lower water cooling jackets. Since the expansion joint is provided, the expansion joint can be sufficiently cooled to maintain its strength in a high-temperature atmosphere, and can be completely sealed against high pressure, thereby improving reliability in high-pressure operation. In addition, an inert gas jet nozzle is installed at the fitting part of the water cooling jacket and the upper and lower water cooling jackets.
Dust is completely prevented from entering the inside of the water/sewage cooling jacket, eliminating dust troubles and eliminating the need for dust removal work, resulting in excellent effects such as improved operating efficiency.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of the converter exhaust gas treatment equipment;
Figures 4 to 4 show a conventional sealing device between a skirt and a hood. Figure 2 is a cross-sectional view showing the whole, and Figures 3 and 4 are enlarged cross-sectional views of main parts. Figure 3 shows the skirt in a lowered state, and Figure 4 shows the skirt in a raised state. FIG. 5 is an enlarged sectional view of essential parts showing an embodiment of a sealing device between a skirt and a hood according to the present invention. 1... converter, 2... skirt, 3... hood,
17, 20...Inner water cooling jacket, 18, 19
...Outer water cooling jacket, 21... Upper water cooling jacket, 22... Lower water cooling jacket, 23...
Expansion joint, 24...Inert gas jet nozzle, 25
...Dust-proof curtain.

Claims (1)

[Claims] 1. A sealing device between a skirt and a hood of a converter exhaust gas treatment device, which consists of an upper water-cooling jacket and a lower water-cooling jacket formed by opposing an inner water-cooling jacket and an outer water-cooling jacket at regular intervals, and an expansion joint. , the upper water-cooled jacket and the lower water-cooled jacket are fitted in a cylindrical shape with the expansion joint therein, the lower water-cooled jacket is fixed to the skirt, the upper water-cooled jacket is fixed to the frame, and the upper water-cooled jacket and the lower water-cooled jacket are fixed to the frame. Between the skirt and the hood in a converter exhaust gas treatment device, characterized in that the skirt can be moved up and down by the cylindrical fitting part of the jacket, and the gas can be completely sealed by the expansion joint. sealing device.